Sit and stand strollers?

Danielle
What are your thoughts? My son will be almost 3 1/2 when this baby is born, but he is still very content with sitting in a stroller. He's 40 pounds, so I wouldn't get a side by side, but I've been considering a sit and stand for him. Anyone have one with an older sibling? Worth it or no? 
If we got one, it wouldn't be compatible with our car seat so it would really be for a few months in, and closer to my sons 4th birthday. 

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